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2014-10-04T08:57:47+03:00
 a) 3x+6y+19=43  Determinati 6y+38+3x
3x+6y=43-19=24  deci

6y+38+3x=6y+3x+38=24+38=62

 b) 2x+2y+38 =62 Deteminati 4y+27+4x
2x+2y=62-38=24  deci
4x+4y+27=2(2x+2y)+27=2·24+27=48+27=75

 c) 5x+18+20y=43 Determinati 15x+38+60y
5x+20y=43-18=25 adica x=4y=5  deci
15x+60y+38=15(x+4y)+38=15·5+38=75+38=113


 d) 3x+2y+4z=30   Determinati   4z+43+2y+27+3 x

4z+43+2y+27+3 x=30+43=73


 e) x+3+y+4+z+4+z+5=12 Determinati 2012+x+y+z


x+3+y+4+z+4+z+5=12  x+y+z=12-3-4-4-5=-4

2012+x+y+z=2012-4=2008





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